MOBMG2: TCS Mg-alloys Mobility Database

The TCS Mg-alloys Mobility Database (MOBMG) is a kinetic database containing atomic mobility data for Mg-based alloys. It provides kinetic data for those working with the add-on kinetic modules – the Diffusion Module (DICTRA) and the Precipitation Module (TC-PRISMA)– as well as a few specific calculation types, such as Scheil with back diffusion.

The MOBMG2 database is compatible and recommended for use in combination with TCMG8, the TCS thermodynamic Mg-based alloys database.

When used with the Add-on Modules and the thermodynamic TCMG8 database, it can help calculate various diffusivities in both solid and liquid solution phases. In Mg-based alloys it can also simulate diffusion-controlled phenomena, such as solidification, nucleation, growth / dissolution and coarsening of precipitates.

MOBMG: TCS Mg-alloys Mobility Database Revision History. The current version of the database is MOBMG2.

Included Elements (33)

Ag	Al	Bi	Ca	Ce	Cu	Dy	Er	Fe	Ga
Gd	H	Ho	In	K	La	Li	Mg	Mn	Na
Nd	Ni	Pr	Sb	Sc	Si	Sm	Sn	Sr	Th
Y	Zn	Zr

Included Phases

HCP_A3 and LIQUID

The phases have diffusion data included in the database. You can include other phases in a diffusion simulation. However, these other phases are treated as so-called diffusion NONE, i.e. there is no diffusion considered in these other phases. Any phase not listed above is automatically entered as diffusion NONE (in Console Mode in the DICTRA module or in Graphical Mode with the Diffusion Module (DICTRA) and/or Precipitation Module (TC-PRISMA)), as long as a thermodynamic description for the phases is retrieved prior to reading data from the mobility database.

Assessed Systems

All data sets are critically assessed against experimental information whenever available. The fact that the amount of experimental diffusion data is limited for Mg‑based alloys has made it necessary to use ab-initio calculations and sound empirical rules extensively in the development of this kinetic database.

Limits

As in the spirit of the CALPHAD method, predictions can be made for multicomponent systems by extrapolation into multicomponent space of data critically evaluated and assessed based on binary, ternary and in some cases higher order systems. However, critical calculations must always be verified by equilibrium experimental data; it is the user's responsibility to verify the calculations but Thermo‑Calc Software AB is interested to know about any significant deviations in order to improve any future release.

The CALPHAD Method

The Thermo‑Calc databases are developed with the CALPHAD approach based on various types of experimental data and theoretical values (e.g. those from first-principles calculations). It is based on the critical evaluation of binary, ternary, and for some databases, important higher order systems. This enables predictions to be made for multicomponent systems and alloys of industrial importance. Among these, the thermodynamic database is of fundamental importance.

The CALPHAD Method and the Thermo‑Calc Databases. Also visit the video tutorials on our website or our YouTube playlist.

Additional Resources

Go to the Magnesium-based Alloys Databases page on our website where you can access this Technical Information plus learn more about the compatible thermodynamic database and its Validation and Calculation Examples Collection. Also explore further applications of Thermo‑Calc to magnesium including links to resources such as examples, publications, and more.